use thiserror::Error;
use anyhow::{Context, Result};

#[derive(Error, Debug)]
pub enum SimpleError {
    #[error("error status")]
    ErrorStatus(u32),
    #[error("unknown error")]
    Unknown,
}

fn main() {
    do_something().unwrap();
}

fn do_something() -> Result<String, Box<dyn std::error::Error>> {

    Err(Box::new(SimpleError::Unknown)).with_context(|| format!("Error unknown!"))?
}